مدل عددی جریان و انتقال رسوبات معلق در مخزن سد پاره سنگی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری؛ گـروه مهندسـی آب؛ دانشکده کشاورزی؛ دانشگاه بوعلی سینا همدان؛ همدان؛ ایران

2 گـروه مهندسـی آب؛ دانشکده کشاورزی؛ دانشگاه بوعلی سینا همدان؛ همدان؛ ایران

3 گـروه مهندسـی عمران؛ دانشکده فنی و مهندسی؛ دانشـگاه بوعلی‌سینا همدان؛ همدان؛ ایران

4 گروه مهندسی عمران-دانشکده فنی مهندسی - دانشگاه مراغه، مراغه: ایران

چکیده

احداث سدهای پاره سنگی فاقد هسته یکی از روشهای سازه‌ای کنترل سیلاب است. جریان ورودی به مخازن این سدها در مواقع سیلابی حاوی مقدار قابل توجهی از رسوبات است. این موضوع اهمیت بررسی رفتار جریان و غلظت رسوبات را به منظور تعیین میزان رسوب عبوری، رسوبات ته‌نشین شده و مدیریت آن دوچندان می‌نماید که در این تحقیق مورد توجه واقع شده است. دراین راستا ابتدا براساس حل عددی معادلات سنت و نانت به روش حجم محدود و با رویکرد کاملاٌ ضمنی مشخصات جریان (سرعت و عمق) محاسبه و سپس با استفاده از گسسته‌سازی معادله انتقال – پخش، میزان غلظت رسوبات در نقاط مختلف مخزن تعیین گردید. به منظور بررسی عملکرد و صحت‌سنجی مدل ریاضی شبیه‌ساز جریان و غلظت رسوبات که در محیط متلب تهیه گردید، از نتایج آزمایش‌های انجام گرفته در آزمایشگاه هیدرولیک دانشکده کشاورزی دانشگاه بوعلی سینا همدان استفاده شد. بر مبنای مقایسه انجام شده بین داده‌های غلظت رسوب ‌اندازه‌گیری شده و محاسباتی در هشت مقطع و در سه لایه عمقی 5، 10 و 15 سانتیمتر در داخل مخزن سد پاره‌سنگی، مقدار میانگین خطای نسبی غلظت رسوب 9.17 درصد می‌باشد که حاکی از تطابق مناسب خروجی مدل شبیه‌ساز ریاضی با مقادیر اندازه‌گیری در مدل آزمایشگاهی است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Model of Flow and Suspended Sediment Transport in the Reservoir of Rockfill Dam

نویسندگان [English]

  • arash nejati 1
  • Majid Heydari 2
  • Jalal Sadeghiyan 3
  • R. Daneshfaraz 4
1 Ph.D. student, Department of Water Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran
2 Department of Water Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran
3 Department of Civil Engineering, Bu-Ali Sina University, Hamadan, Iran
4 civil department-university of maragheh
چکیده [English]

Building non-core rock-fill dams is certainly one of the most effective methods of controlling floods. In flood situations, the input-flow of these dams typically contains a considerable amount of sediments. This underscores the need to study the flow behavior and sediment concentrations so that one could identify the amount of passing and depositing sediments, and decide on their management, all of which have been taken into account in the present research. Thus, first, on the basis of numerical solution of saint-venant equations, the flow characteristics (e.g. depth and velocity) were calculated, using finite volume method with a completely implicit method, and then the concentration of the sediments at different points of the reservoir were determined, using discretization of the convection diffusion equation. The results of the experiments conducted on the reservoirs of rock-fill dams in the hydraulic laboratory of Bu Ali Sina Un., Hamedan were then employed to assess the functioning and validation of the mathematical model of flow simulator and sediment concentration. On the basis of the comparison drawn between the data yielded by measurement of sediment concentration and the calculations conducted in eight sections and three height layers of 5, 10 and 15cm in the reservoir of rock-fill dams, the mean value of the relative error of sediment concentration was found to be 9.17 percent, indication a good enough correspondence between the output of the mathematical simulator and the value measured in the experimental model.

کلیدواژه‌ها [English]

  • Reservoir of rock-fill dams
  • Unsteady flow
  • Convection diffusion equation
  • finite volume method

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